Knee rest



FIG. 1 is a front perspective view of the knee rest showing my new design;

FIG. 2 is a front perspective elevation view thereof, with the top cloth lifted for ease of illustration;

FIG. 3 is a close-up bottom perspective view of the top portion of the knee rest;

FIG. 4 is a front elevation view thereof; and,

FIG. 5 is a side elevation view thereof.

The broken lines shown in the drawings represent portions of the knee rest that form no part of the claimed design. 

CLAIM I claim the ornamental design for a knee rest, as shown and described. 